Most Econ 101 classes start with an explanation of fixed and marginal cost in the context of factories. The factory is the principal fixed cost expensive and permanent. Canvas wants to smash this assumption of expensive, inflexible, factories by replacing infrastructure with autonomous vehicles. The Boulder-based startup is announcing its first product this morning an autonomous cart designed to shuffle goods around chaotic and unpredictable factory floors. Traditionally, factories install conveyor belts when they want to regularly move goods from one place to another. The problem with this is that,…